For some reason, this is not true of Canvas discussions however. Rather, students must click on the "settings gear" and select "show rubric" to generate a pop up display. This is not ideal, and most of our students forget that rubrics even exist for our online discussions. As an adaptive measure we have begun taking screenshots of our discussion rubrics once they are built and then inserting them at the bottom of the discussion prompt. This is quite time consuming, but we need to do this to keep our student's replies focused and on topic.
I would propose that rubrics for discussions are displayed automatically at the bottom of every discussion prompt, just as they are for general assignments. Or, at the very least, make it a course setting: "display discussion rubrics automatically."
Thanks for considering!